Abstract
Hybrid electric vehicles (HEVs) are one of the most energy efficient vehicles for urban traffic use. Most of the HEVs on the current market are non-externally chargeable hybrid electric vehicles. ISO standardizing for the fuel consumption test methods for this type of vehicle has just been completed. However, as HEVs are still in the development stage, the standard only covers the basic aspects of the test method and the accuracy of quantity-of-electricity measurements needs to be considered. In this paper, we discuss the effect of the accuracy of quantity-of-electricity measurements on fuel consumption measurements. We also propose measurement guidelines for achieving the required accuracy for the resultant fuel consumption for every HEV.
Highlights
Achieving energy savings in the transportation sector, especially for vehicles, is a priority in the context of global warming
Fuel cell electric vehicles (FCEVs), which are expected to achieve the highest energy efficiency, and emission-free vehicles will require a hybrid system in order to be sufficiently efficient for practical urban use
The error in the quantity-of-electricity measurement affects the total accuracy of fuel consumption tests of non-externally chargeable Hybrid electric vehicles (HEVs)
Summary
Achieving energy savings in the transportation sector, especially for vehicles, is a priority in the context of global warming. Hybrid electric vehicles (HEVs) are anticipated to improve the energy efficiency of vehicles designed for urban use. Fuel cell electric vehicles (FCEVs), which are expected to achieve the highest energy efficiency, and emission-free vehicles will require a hybrid system in order to be sufficiently efficient for practical urban use. ISO FDIS 232741) defines following three procedures to obtain fuel consumption of HEVs without the SOC change ('SOC or 'Q) effect of on-board energy storage systems during the test period: 1. Application of the test result with a negligibly small 'SOC As the latter two procedures are based on the first procedure (linear regression method) the accuracy of HEV fuel test should be basically discussed in relation to the linear regression method. Fuel consumption tests for HEVs require quantitative measurement of electrical charge 3toand 3from RESS, and errors in this measurement will reduce the total accuracy of the test. We propose guidelines for performing quantity-of-electricity (quantity of electrical charge; expressed in Ah) measurements to ensure a high total accuracy of fuel consumption tests
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